Goodwill (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Goodwill [Line Items]
Goodwill at beginning of year	$ 392,177
Accumulated impairment losses at beginning of year	(15,914)
Goodwill at beginning of year	376,263
Goodwill acquired during year	5,106
Impairment losses	0
Goodwill at end of year	397,283
Accumulated impairment losses at end of year	(15,914)
Goodwill at end of year	381,369
Bakery [Member]
Goodwill [Line Items]
Goodwill at beginning of year	51,462
Accumulated impairment losses at beginning of year	0
Goodwill at beginning of year	51,462
Goodwill acquired during year	1,688
Impairment losses	0
Goodwill at end of year	53,150
Accumulated impairment losses at end of year	0
Goodwill at end of year	53,150
Rendering [Member]
Goodwill [Line Items]
Goodwill at beginning of year	340,715
Accumulated impairment losses at beginning of year	(15,914)
Goodwill at beginning of year	324,801
Goodwill acquired during year	3,418
Impairment losses	0
Goodwill at end of year	344,133
Accumulated impairment losses at end of year	(15,914)
Goodwill at end of year	$ 328,219